Concept Question What do you think the eigenvectors of the element stiff- ness matrix represent? 1. a basis in which the stiffness matrix would be diago- nal (if rotated to that basis) 2. a set of nodal displacements for the element corre- sponding to the physical deformation modes of the element (rigid translations and rotation, pure shear pure stretchin 8, combined shear. combined stretch ing, pure dilatation /compression, etc. 3. nothing in particular, it's just a mathematical con cept dissociated from any physical interpretation Statement Statement(2 2345 Statement(1) and(2) Statement( 3) DKDU++++ ++++ ++++ ++++ ++++ Concept Question ++++ ++++ ++++ ++++ ++++ What do you think the eigenvectors of the element stiff­ ness matrix represent? 1. a basis in which the stiffness matrix would be diago￾nal (if rotated to that basis) 2. a set of nodal displacements for the element corre￾sponding to the physical deformation modes of the element (rigid translations and rotation, pure shear, pure stretching, combined shear, combined stretch￾ing, pure dilatation/compression, etc.) 3. nothing in particular, it’s just a mathematical con￾cept dissociated from any physical interpretation. 1. ++++ Statement (1) 2. ++++ Statement (2) 3. ++++ Statement (1) and (2) 4. ++++ Statement (3) 5. ++++ DKDU